The water level upstream of Sekto's dam drops drastically when Stranger destroys that. Though waterfalls between there and Ma'Spa prevent actual draining of the spawning grounds, these waterfalls no longer pour into pools but onto exposed areas of rock. This prevents the biannual migration of the Spiddy-Fish - a great, four-eyed creature which uses vortexes in waterfalls to draw itself up them. Without the Spiddy-Fish to consume the Very Mungy Algae that grows on the rocks in the pools near Ma'Spa, the stream will be overgrown with this invasive water-weed.
As the Very Mungy Algae spreads upstream toward Ma'Spa, the Rainbow Trounce that dwell in the wide, shallow pools will no longer be able to peck off the tiny crustaceans living on the pebbly bottoms, as the algae will get caught between their teeth - and they haven't yet invented toothbrushes.
After some weeks, the Rainbow Trounce will die of starvation, and their rotting corpses will cause a rapid increase in the numbers of flesh-eating Spangle-Worrums. The Spangle-Worrums, having eaten all the Trounce corpses (and having extinguished any survivors) will spread upstream (travelling downstream is impossible past the waterfalls). Though baby Gabbits are too bony for the Spangle-Worrums' liking, Freshwater Anenomenonemones are considerably more to their tastes.
Freshwater Anemonomenenomes, as everyone knows, are large and delicious-looking. However, they are also filled with a deadly gas. The Spangle-Worrums, upon eating them, will explode with massive and fiery explosions!!!, WIPING MA'SPA OFF THE MAP BWAHAHA!!!!
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